感觉在单元测试当中可能有用，

但在django这种框架中，用途另一说。

 

import pytestimport tasksfrom tasks import Taskdef test_add_1():    task = Task('breathe', 'Brian', True)    task_id = tasks.add(task)    t_from_db = tasks.get(task_id)    assert equivalent(t_from_db, task)@pytest.mark.parametrize('task',                         [Task('sleep', done=True),                          Task('wake', 'brian'),                          Task('breath', 'BRIAN', True),                          Task('exercise', 'BrIaN', False)])def test_add_2(task):    task_id = tasks.add(task)    t_from_db = tasks.get(task_id)    assert equivalent(t_from_db, task)@pytest.mark.parametrize('summary, owner, done',                         [('sleep', None, False),                          ('wake', 'brian', False),                          ('breath', 'BRIAN', True),                          ('eat eggs', 'BrIaN', False),                          ])def test_add_3(summary, owner, done):    task = Task(summary, owner, done)    task_id = tasks.add(task)    t_from_db = tasks.get(task_id)    assert equivalent(t_from_db, task)tasks_to_try = (Task('sleep', done=True),                Task('wake', 'brian'),                Task('breath', 'BRIAN', True),                Task('exercise', 'BrIaN', False))@pytest.mark.parametrize('task', tasks_to_try)def test_add_4(task):    task_id = tasks.add(task)    t_from_db = tasks.get(task_id)    assert equivalent(t_from_db, task)task_ids = ['Task({},{},{})'.format(t.summary, t.owner, t.done)            for t in tasks_to_try]@pytest.mark.parametrize('task', tasks_to_try, ids=task_ids)def test_add_5(task):    task_id = tasks.add(task)    t_from_db = tasks.get(task_id)    assert equivalent(t_from_db, task)    @pytest.mark.parametrize('task', [    pytest.param(Task('create'), id='just summary'),    pytest.param(Task('inspire', 'Michelle'), id='summary/owner'),    pytest.param(Task('encourage', 'Michelle', True), id='summary/owner/done'),])def test_add_6(task):    task_id = tasks.add(task)    t_from_db = tasks.get(task_id)    assert equivalent(t_from_db, task)@pytest.mark.parametrize('task', tasks_to_try, ids=task_ids)class TestAdd:    def test_equivalent(self, task):        task_id = tasks.add(task)        t_from_db = tasks.get(task_id)        assert equivalent(t_from_db, task)    def test_valid_id(self, task):        task_id = tasks.add(task)        t_from_db = tasks.get(task_id)        assert t_from_db.id == task_iddef equivalent(t1, t2):    return (t1.summary == t2.summary) and (t1.owner == t2.owner) and (t1.done == t2.done)@pytest.fixture(autouse=True)def initialized_tasks_db(tmpdir):    tasks.start_tasks_db(str(tmpdir), 'tiny')    yield    tasks.stop_tasks_db()